The short answer. The mistakes that most often stall a first round usually aren't in the pitch. They come earlier: raising too soon, asking for a number with no calculation behind it, starting with barely enough cash, picking the wrong market, or arriving with co-founders who haven't agreed anything in writing. During the round, the most expensive mistake is claiming more than you can back up. Almost all of them can be caught in time if someone looks at the whole startup from the outside.
What you'll learn
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The 12 mistakes that most often stall a first round, grouped into before, during and after.
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The early warning sign for each one, and what to do instead.
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Why startups fail, from what I've seen over almost 30 years.
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A real case of a product that found a buyer by changing market.
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A checklist to see how many of these mistakes you're making today.
I'm writing this guide in the first person because it comes from what I've seen working with founders in the Americas, Europe and Asia. (Meet Jordi Gil)
Why is the first round the hardest?
Because you arrive with no track record. In a first round the investor can't look at how your last round went: all they have is what you tell them, what you can prove and the impression you leave. And they don't have much time: according to DocSend, in 2023 the average time investors spent reading a seed pitch deck dropped below two minutes for the first time.
On top of that, the first time around you don't know what you don't know. You prepare a lot, but sometimes in only one direction.
"Out of every 10 founders who didn't close their round, 9 didn't have the full picture of why. They suspected some of the reasons, but they couldn't see all of them." — Jordi Gil
What are the most common first-round mistakes?
The 12 mistakes, by when they happen
- 1 Raising too early
- 2 A number with no calculation
- 3 Starting with barely enough cash
- 4 The wrong market
- 5 Co-founders with no agreement
- 6 Documents not in order
- 7 Pitching to any investor
- 8 Claiming more than you can back up
- 9 Improvising the hard questions
- 10 Negotiating only on valuation
- 11 Neglecting the business
- 12 Not learning from the "no"
How to read it. Look at the first column. Six of these twelve mistakes happen before you talk to a single investor, which is exactly when they're cheapest to fix.
Mistakes before you start raising
1. Raising too early
Warning sign: your main argument is that "everyone needs this," but you have no customers, pilots or repeat usage to prove it. What to do: check first whether your startup is ready. If the market proof isn't there, no pitch will make up for it. (Is your startup ready to raise?)
2. Asking for a number with no calculation behind it
Warning sign: the number is a round one and you can't explain where it comes from or what you'll achieve with it. What to do: work it out from the bottom up, starting from the milestones for the next round: spend minus revenue over the months you need, plus a margin in case the round slips, minus the cash you have. (How much to raise in your round)
3. Starting with barely enough cash
Warning sign: you have less than six months of cash and you haven't had your first meeting yet. What to do: rounds take longer than planned. Extend your runway before you start and plan around a cautious scenario. Negotiating in a hurry almost always costs you. (Runway and burn rate)
4. Picking the wrong market
Warning sign: you get turned down again and again for the same reason, even though people like the product.
What I've seen A food company had a very good natural formula from Latin America and wanted to turn it into a drink: a blue, still soft drink. It got turned down again and again. The product wasn't the problem. The market was: soft drinks are one of the most crowded markets there is. Changing what it sold, the formula instead of the drink, opened the door to a deal with a buyer in China.
What to do: before you change the product, ask yourself whether you're in the right market with the right model. Sometimes the way out is selling something else to a different customer.
5. Arriving with co-founders who haven't agreed anything
Warning sign: there's no shareholders' agreement, nobody has talked about what happens if someone leaves, or each co-founder's commitment doesn't match how the equity is split. What to do: sign the agreements before the round, not during it. I've seen co-founders fall out just as the round was arriving: the pressure of a negotiation brings out everything that was never discussed. A shareholders' agreement with vesting protects everyone, investors included.
6. Leaving the documents until someone asks for them
Warning sign: the cap table doesn't match the deeds, or the code was written by a freelancer with no assignment agreement. What to do: prepare the data room before the first meeting. What takes days to fix before you start can cost weeks in the middle of a round. (Pre-seed and seed data room)
Do it with a method How many of these six mistakes does your startup have today? The Startup Index Score evaluation looks at your whole startup, from the outside, against what investors at your stage look at. Free: your level from 1 to 5 and your first three priorities, in 30–40 minutes. (Start the evaluation)
Mistakes during the round
7. Pitching to any investor
Warning sign: you've sent the same email to dozens of investors without checking what they back or what check size they write. What to do: choose investors by sector, stage and check size, and get introduced by someone they trust. In Spain, the median a business angel invested over the whole of 2024 was €20,000, according to AEBAN and IESE: you'll need several and, almost always, someone to lead. (What business angels look at)
8. Claiming more than you can back up
Warning sign: your pitch contains figures you couldn't show a document for if someone asked tomorrow. What to do: separate what you say from what you can back up and from what's missing. An inflated number that the investor catches doesn't just fall on its own: it drags all the others down with it. An experienced investor is suspicious precisely of what's told too well.
9. Improvising the hard questions
Warning sign: you've never rehearsed with an outsider who tries to take your story apart. What to do: prepare the questions by topic, answer in writing with numbers, and rehearse. If there are several co-founders, rehearse together: two different answers to the same question weigh more than any number. (The questions an investor will ask you)
10. Negotiating only on valuation
Warning sign: you know what valuation you want, but not which terms come with the offer. What to do: read the offer as a whole: instrument, preferences, investors' rights, shareholders' agreement. A high valuation with tough terms can cost you more than a reasonable one with clean terms. Work with a lawyer who has done rounds before.
11. Neglecting the business while you raise
Warning sign: you've spent weeks on almost nothing but meetings, and sales have stalled. What to do: split the work. Raising takes months, and a business that slows down during the round arrives at the final negotiation in worse shape. I've seen good projects lose sight of their core business while chasing the round, and never find their way back.
Mistakes after the round (or after the "no")
12. Not learning from the "no"
Warning sign: you've had several "no"s and your next pitch is the same as your first. What to do: a "no" is incomplete information. Ask what the investor would need to see to talk again, look for the pattern across the "no"s and fix things before you carry on. Running the same round with new investors just piles up rejections. (After an investor says no · An investor said no)
And if you do close the round, the next mistake is spending without milestones. The round's money buys the milestones for the next one: if you don't chase them from the first month, the next round will be harder than this one.
What does the investor read into each mistake?
Founders tend to see their mistakes as details. Investors read them as signals of how you'll run the company with their money:
| What the founder thinks it is | What the investor reads |
|---|---|
| "It's early, but customers will come" | They can't measure whether the market is responding |
| "We'll fine-tune the number later" | They haven't thought about what they'll spend it on |
| "Cash is tight, but we'll close quickly" | They'll negotiate in a hurry and accept bad terms |
| "We'll sign the shareholders' agreement later" | A co-founder split is waiting to happen |
| "The documents exist, they just need sorting" | Anything I ask for will take weeks |
| "That number is an estimate" | The others may be too |
| "I wasn't expecting that question" | They don't know their weak spots |
Tip Before every meeting, go through this table and ask yourself what an investor would read into your startup today. Whatever you'd rather they didn't read is the first thing to fix.
Summary table: warning sign and what to do
| Mistake | Warning sign | What to do |
|---|---|---|
| 1. Raising too early | No market proof | Validate before raising |
| 2. A number with no calculation | A round number | Work it out from the milestones |
| 3. Barely enough cash | Under 6 months of runway | Extend cash before raising |
| 4. The wrong market | The same reason for every rejection | Rethink market and model |
| 5. No co-founder agreement | No shareholders' agreement | Sign before the round |
| 6. Documents not in order | A cap table that doesn't match | Data room before the meeting |
| 7. Any investor | Mass emails | Choose by sector, stage and check size |
| 8. Claiming more than you can back up | Numbers with no document | Separate what's said, what's backed and what's missing |
| 9. Improvising | No rehearsal | Rehearse with an outsider |
| 10. Only the valuation | Terms not read | Read the offer as a whole |
| 11. Neglecting the business | Sales stalled | Split the work |
| 12. Not learning from the "no" | The same pitch | Find the pattern and fix it |
Why do startups fail, from what I've seen?
Studies put numbers to the causes of failure. In CB Insights' March 2026 analysis of 431 venture-backed startups that shut down since 2023 (385 with an identified cause), 70% ran out of capital, 43% didn't find product-market fit and 29% cited bad timing. The report itself warns that running out of capital is almost always the final cause, not the root problem.
Most cited reasons for shutting down (CB Insights, 2026)
What I've seen Behind those figures, what I've seen in almost 30 years keeps repeating itself: a lack of resources and experience, decisions made in a hurry and under pressure, too little time to think, and not surrounding yourself with the right people. And something that almost never shows up in the studies: the vast majority of founders weren't aware of what ended up holding them back. If they'd seen it in time, many would have fixed it.
That's why I insist so much on the outside view. From the inside, the day-to-day doesn't let you see the whole. From the outside, you can see what's missing.
How can you avoid these mistakes without a consultant at your side?
- Assess yourself before you start raising, not after the first "no."
- Work in order of priority: start with what's holding your round back most, not with what you enjoy most.
- Ask an outsider to try to take your story apart. A mentor, another founder, an investor who isn't going to invest.
- Document everything you claim. If you can't show it, don't present it as fact.
- Measure yourself again before each stage of the round.
Checklist: how many of these mistakes are you making?
Before your first round
A guide, not a rulebook. You can print it.
In short
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Six of the twelve mistakes happen before the first meeting, when they're cheapest to fix.
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The most expensive ones before you start: raising early, a number with no calculation, barely enough cash, the wrong market and co-founders with no agreement.
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During the round, the most expensive: claiming more than you can back up.
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Read the offer as a whole, not just the valuation.
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A "no" is information: find the pattern before you carry on.
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Almost all of them can be caught early with an outside view.
Do it with a method Look at your whole startup, from the outside, before your first round. Evaluate your startup with Startup Index Score: free, in 30–40 minutes. (Start the evaluation)
Frequently asked questions
What's the most common mistake when raising money for the first time? Raising too early, without enough proof that the market is responding. Many founders mistake interest in their idea for traction and start raising before they can show it. The result is a string of "no"s that don't explain what was missing.
Why can't I raise money for my startup? The usual causes are thin market proof, numbers that don't back the story, an ask with no calculation, doubts about the team, or investors who don't match your sector, stage or check size. There's almost never just one cause: it pays to look at the whole startup before pitching again.
How long does it take to raise a first round? It varies a lot, but allow several months between the first meeting and the money in your account, plus the weeks of preparation before. That's why your runway should cover the round and a margin in case it slips. Preparing before the first meeting shortens the timeline.
Is it a mistake to raise if my startup can grow on its own? Not necessarily, but it's worth thinking through. If your business can grow on its own revenue, a round may impose a pace and a dilution you don't need. Investment makes sense when it accelerates something that already works or makes possible what you couldn't fund any other way.
What should I do if I've already made some of these mistakes? Pause the round just long enough to fix them. Put what's holding you back most in order of priority, fix what can be fixed in weeks, and measure yourself again before pitching. Coming back with something corrected and provable usually counts for more than a bad start.
Keep reading
Sources
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CB Insights, "The top reasons startups fail," March 2026: www.cbinsights.com/research/report/startup-failure-reasons-top/
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DocSend, "Startup Fundraising" (2023): www.docsend.com/startup-fundraising/
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AEBAN and IESE, "Business Angels 2025. La inversión en startups: actividad y tendencias": www.iese.edu/media/research/pdfs/78716.pdf
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The rest of this guide reflects Jordi Gil's experience.
About the author
Jordi Gil is the creator of Startup Index Score. He has spent almost 30 years developing projects and working with startups in the United States, Colombia, Costa Rica, Spain, England, Belgium and China, in sectors such as health, food, technology, sport and real estate. (Meet Jordi Gil)